TmoNews is reporting that T-Mobile will be making some changes to their prepaid offerings starting March 24. The changes are part of T-Mobile's new "Uncarrier" revamp which will mean the eventual elimination of contracts, subsidies and early termination fees for postpaid customers. If you are interested in the postpaid changes, TmoNews has a good breakdown here. For details of the prepaid changes read on.

The TmoNews report is based on leaked training materials intended for sales personal at national T-Mobile dealers like BestBuy, Costco and Target. It appears genuine, but last minute changes to unannounced plans do happen so consider it a rumor for now. Here's what's supposed to be changing:

$1 Pay by the Day - discontinued, current customers will be grandfathered.

Web Guard - This annoying "Web Nanny" will be opt-in rather than the default.

Black Berry Internet Service which currently is a $10 add-on will be available at no charge.

$10/month Unlimited International Talk & Text can be added to "any plan".

The leaked documents also say that there will be no changes to Pay As You Go or prepaid Mobile Broadband plans. But it's unclear what's happening with the the $70 Monthly 4G plan or the $30 "Walmart" plan that includes 5 GB of high speed data, 100 voice minutes and unlimited messaging.

The documents contradict themselves on the $70 plan. It currently includes unlimited, unthrottled data. But in one place in the document it says the plan will include only 5 GB of 4G data. In another place it says; "Unlimited talk, text, web with high-speed data! Customers enjoy no caps, no limits and no overages" In the TmoNews article's comments, someone quotes a "T-Mobile Regional Territory Manager" as saying that the 5 GB cap reference is a typo and there will be no changes to the $70 plan. I tend to believe that as the $70 plan was just upgraded from 5 GB to unlimited a couple of weeks ago and has been advertised by T-Mobile on TV as having unlimited data.

The future of the $30 5GB plan is not clear. It's not mentioned at all in the documents, but that makes sense as it's only available at Walmart and online, not through the national retailers that the documents are intended for. My gut feeling is that the plan will continue to be offered by Walmart and probably online as well. But we won't really know until the 24th. If you want that plan I recommend activating it before Sunday the 24th if possible.

Provided the $30 5GB plan remains available and the $70 plan keeps its unlimited data these plans are almost entirely good:

BlackBerry users get free BIS

$50 and $60 plan users get more data.

The international add on, which is currently restricted to $50 and higher plans will be available on all plans. I wonder if that includes pay as you go? (I'm guessing probably not).

Few will miss Web Guard being turned on by default. It blocked lots of innocent sites likeTwitter and blogs hosted on Blogger and Wordpress.com and was a pain for international visitors who had to show their passports at a T-Mobile store to get it removed.

The only real negative is the loss of the $1/day unlimited text plan. It was handy for pay as you go users who could switch to it on days when they needed to send lots of texts. It's grandfathered, but that probably means that if you switch back to pay as you go you can't go back to the $1/Day plan.

Unless you need roaming, people on the no-longer-promoted $30/1500/30MB plan might be better served by Ultra's $29/unlimited/50MB plan. The flavor of these changes gives the feeling that in general T-Mobile doesn't want to play in the under-$50 space, leaving that to the MVNOs like Ultra and PTel.

This plan would be a good choice for me if I could order the $10, 500mb option they advertise. I asked CS when this data service expires. Their CS says I cannot even order it yet, so they do not know. They are still a work in progress. We may never see Ultra Pay-go. It is nice to have a Pay-go option for flexibility if my needs change. Tmobile plans are very flexible, and the roaming means I do not have to carry a backup phone and pay $3-5 more per month for that service. And nothing beats the Tmobile $30, 100/Unlim/5GB for data.Ultra does not offer BIS.

I just switched one of my Pay-go lines to the $1/day plan. Besides unlimited texts, the minute rate is 10c on this plan without having to spend $100/year. I still have one line on the OLD $1/day plan. You get unlimited calling before 7am and after 7pm for $1/day. 10c/minute voice.

Our family is paying a total of $216/month for 4 personal lines and 2 business lines. All but one of the lines are prepaid. I could replace these with 5 lines on the new Tmobile Value Family Plan for $147/month including taxes, saving $69/month.

No, but it is easy to do. Order the micro-SIM or just cut down a regular SIM after you set up your on-line account. There is no way to get the temporary online account password on the iPad, so set up the account with the SIM in a phone before cutting the SIM, unless you use an iPhone 4 or 4S to get the pw.You can also set up the iPad on a Tmobile mobile broadband plan, but you have to call customer service. They have to do a work-around in their system. I use the broadband plans because I can start and stop without losing the account and starting over. The $25/1.5gb plan is enough for me most months, but sometimes I only need a week for $15. You could also use the $3/day phone plan and get up to 200mb full speed.

New Tmobile website is up. New info:1. $10 mbb plan with phone line prices in cart as $20 with "$10 reduction on first bill." Not stated whether this is permanent reduction.2. BIS sold as NSP only on $50 or above plans, not the $30 100m/5GB plan. It still costs $10/month with that.3. They are charging $10 for SIMs now.4. It was hard for me to find the prepaid home page from the main page:http://prepaid-phones.t-mobile.com/5. There is no listing for either $30 monthly plan on the prepaid site.

I was wrong about the $30/month plans. They are listed at the bottom of this page:http://prepaid-phones.t-mobile.com/prepaid-plansThe $30, 1500/30mb plan is now listed as a plan you have to order in a Tmobile store.

When you log in to MyAccount, you see updated options under Change Plans. The $1/day option and the $30/month 1500/30mb options are gone. There are new options to order for monthly plans.If you begin to switch away from the $30/mo. 100m/5gb plan you are warned that you cannot go back to this plan. There is NO such warning when you begin to switch from the $1/day plan, so BE CAREFUL if you want to keep this one.